The border around Guam’s territorial flag is red.
Guam’s flag consists of a dark-blue field, a narrow red border and the seal of Guam at its center. The flag was adopted in its original form in 1917 and formally adopted in 1930; the red border was added in 1948.
The border carries historical meaning. It represents bloodshed during World War II and earlier periods of Spanish sovereignty. The central seal adds further local symbolism: it depicts a proa, a traditional outrigger canoe, sailing near Hagåtña Bay, with Two Lovers Point in the background. Its almond-like shape recalls sling stones associated with the ancient Chamorro people.
The border can be overlooked because it is thin compared with the large blue field. It is also easy to confuse the flag’s red border with the red lettering in the seal. Guam’s flag specifications describe a two-inch red border around a 78-by-40-inch blue rectangle, making the color unmistakably part of the territorial design.